Afghan Doctor, 6 Americans Killed in Afghanistan Attacks

An Afghan doctor and six Americans were killed in two attacks Saturday in Afghanistan, as the top U.S. military officer began a visit to the country.

The deadliest attack happened in southern Afghanistan's Zabul province, where a car bomb killed six people, including the Afghan doctor and three U.S. soldiers. A separate attack in the country's east killed a U.S. citizen.

The attacks come as the chairman of the U.S. Joint Chiefs of Staff, General Martin Dempsey, arrived in Afghanistan to meet with American and Afghan officials and assess the number of U.S. troops who should remain in the country to train Afghan soldiers after next year.

General Dempsey is expected to also visit with American troops in the field, as part of the effort to plan the U.S. role in Afghanistan following the withdrawal of combat units by the end of 2014.

It is not clear yet how many foreign troops will remain to assist the Afghan army with still-volatile security.